Tool for extracting and replacing bushings



Nov. 24, 1931. J. D. HAMAN 1,833,420

TOOL FOR EXTRACTING AND REPLACING BUSHINGS Filed Jan. 7. 1928 for the purpose is held in the piston beswinging movable jaw outward, after disengaging pawl 19, and after the inwardly V projecting ends ofthe jaws 14; and-15 are inserted in recesses 23 and 24 in opposite side edges of the nut said pawl or dog drops into position to engage the edge of the body portion of the wrench for holding the wrenchin connection with the nut. By reference to Fig. 1 it Willi be noted that when'the parts of the tool are in this positionwith respect to the cylinderf land bushing-to be removed the turning-of shaft 1 by handle 2. .and holding thewrench stationary will result in pressing the nut against the bushing and thereby forcing it into the sleeve..6,.which latter during 7 this. operation presses against the outer side of the piston.v In practice a. nut of a length I approximating the. distance between the two. wrist-pin bearings 21 and22 maybe andpref+ erably is employed to permit the bushing to be entirely removed into the sleeve, the said 4111115 beingiengagedby the wrenchat its inner end or distant from the bushing jbeing removed. Furthermore, by having the shaft of the same diameter as the internal diameter of the bushings and of a length greater than the diameter of the piston said shaft may exa tend'through both bushings sothat it will be held in perfect alignment toproperlyguide the bushing being removed andthereby prevent it from binding or jamming inthe hearing. enabling the operator to easily and con veniently remove both bushings from a piston, it being understood that'th'e shaft is so aligned in both instances-in one instance by the old bushing opposite the one being removed. and the new onelinserted, and in'the' other instance by the new bushing on revers-- ing the; tool and passing it through the re! maining old bushing into the new one.

For the purpose of inserting a bushing into the wrist-pin bearing of the piston, as illustrated in 2.1 employ in connection i with the shaft and spanner-wrench another j menteof the spanner-wrench to hold this nut against rotation in the same manner and for -like purpose nut 7 is held. but "in", this instan'ce nut. 25 being of greater diameter form of nut. designated by the numeral 25 (Fig. 2'), said nut-being provided with an annular recess 26 at one end to receive-the inner end ofthe'inserted bushing so that it mav project beyond'the inner end of the .wrist pinfbearing. the rim 27 around'the aforesaid recess being adapted to engage the inner end. of the bearing. 21 0122, while'the other end of said nut is provided with recesses;

28 and'29 in its 'oppositeedges for engagethan nut 7 so as to engagethe wrist-pinbear- I ing instead of passing into the same itis I embraced and engaged by the wider spaced jaws 12 and 13, and the said nut 25 being narrower than the space between the wristpin bearings the jaws 12 and 13 are integral with the body of the wrench and engage the aforesaid recesses28 and 29 by moving the wrench laterally. In the operation of in-' serting a bushing the latter is pushed on to i the shaft from the threaded end thereof and positioned on the unthreaded portion of saidv shaft against the washer 5." The shaft is then inserted through the bearing into and. through nut 25 on and through the opposite bushing, after which the nut is broughtllp against the inner end 30'of thebearing and. a

' held by the wrench so that whenthe shaft is turned the bushing :Will be forced into place, bearing at its outer end against washer 7 I 5,for in this instance sleeve 6 isdispensed with, and as'the-shaft is centered .by the op.-

nosite bushing alignment will be maintained for the proper insertion-of the newbushing.

In both instances, removing a bushing. and inserting anew one, the length of the. shaft or screw by which the required po wer .is'a p-v f plied provides for accurately centering said shaft to effectively prevent thebushing from becoming'jammed in thewrist-pin bearing;

fconsequently the ends of the wrist-pin bearings could be untrue or warped without affecting the operationfof the tool which is aligned'by the bushings 'as -hereinbefore stated. For instance, ifthe inner end-30lof the wrist-pin hearing was warped, or; not" true. the nut 25' pressing against the samewouldhave a tendency to be thrown out. of alignment andthe shaft likewise disturbedthus 'afiecting thealignment of the bushing with respect to the bearing in which it is 7 being inserted. but in the present instance this is avoided by having the operating shaft I or screwextend through the opposite bushing for accurately centering-said screw and the bushing thereon either in inserting'a bushing orremovm'g an old bushing.

1 From the foregoing descript n in'connection with the accompanying drawings itwill.

be readily seen that Iv p ovide a tool-for removing and inserting bushings injth'e wrist 1 pin bearings of an engine piston" that will afford the required power to accomplish the operations easily and effectively, andj al embodiment of my invention it'will be an,-

der'stood that-modifications or changes may. be made within thespirit and scop'e'of my claimS- H v V A I claim: Y V

1. A tool for operating. on spaced aligned,

the internal 1 diameter of] the bushing" to I be operated upon and of a length greater than bushings comprising a-screwthreaded shaft: of a diameter throughoutits length equallto V though 'I 'have herein. disclosed the preferred 1 I the distance between the outer ends of said aligned bushings, a compression member, and

a nut threaded on the shaft intermediate'the bushings to cooperate with said compression member. 7

2. A tool for extracting bushings comprising a screw threaded shaft of a diameter throughout its length equal to the internal diameter of the bushing to be extracted, a

10 thrust portion and operating means at the end of said shaft, a a cylindrical element I I closed at one end and loosely mounted on said shaft, coaxial therewith, having an in ternal diameter equal to the external diameter of the bushing to be operated upon, the closed end of said element having an open: ing to receive said shaft and bear against said thrust portion, and a nut of a diameter about equal to the external diameter of said bushing operativelv engaging said shaft intermediate the bushings and adapted to receive a wrench.

3. A tool for operating upon bushings in spaced alignment comprising a shaft ,thread- 7 ed for the major portion of its length with a plain portion at the inner end thereof, said shaft being of a diameter throughout its length equal to the internal diameter of the bushings to be operated upon and of a length greater than the distance between the outer ends of said aligned bushings, a cup-shaped compression member the internal diameter of which is equal to the external diameter of the bushings and the closed end of said compression member having a plain opening to receive the plain portion of the shaft intermediate the bushings, and a nut threaded on the shaft to cooperate with the compression member.

4:. A tool for extracting bushings comprising, a threaded shaft having a thrust portion and operating means at one end thereof, said shaft being of a diameterequal to the internal diameter of the bushing to be extracted. a cvlindrical element loose on said shaft, coaxial therewith, having an internal diameter equal to the external diameter of the bushing to be extracted, said element having arclosed end with an opening to receive said shaft and bear against said'thrust portion, and a nut operatively engaging the shaft,

said nut having recesses at opposite sides of one end thereof adapted to receive a wrench having spanner jaws for engaging said recesses,

5. A tool as described in claim 4 said wrench comprising a flat piece of metal, having one stationary jaw and one movable jaw.

JOHN D. HAMAN. 

